This video covers Lewis dot structures of single atoms, as well as how to calculate the number of valence electrons using the periodic table. There are two slightly different methods of writing these. I cover both, but before your first quiz you should as your teacher exactly how they want these single-atom Lewis dot structures done so you don't lose any points doing them the "other" way.
Lewis Dot Structures of Molecules
Single bonds, double bonds, triple bonds: this video covers about 80% of the Lewis dot structure problems you're likely to see. Teachers tend to make these seem super-hard, but as with most topics, once you see me lay out the step-by-step process that will work every time, you too will wonder why your teacher didn't just teach it this way in the first place!
Exceptions to the Octet Rule of Lewis Structures
Almost every atom is super-happy to have eight valence electrons, but there are exceptions that most teachers will expect you to know, and which can wreak havoc on your Lewis Dot Structres. Boron, just six? Sulfur, 12? You're crazy!
Lewis Structures Of Ions
These are really similar to Lewis structures of molecules, except the ionic charge gives you a couple extra (or fewer) dots to play with in your Lewis structure. Also, your teacher may or may not want you to draw giant brackets around your answer.
When a Lewis structure requires a double bond, you've probably wondered to yourself, "Which bond should I make double?" Good question. Lewis makes you pick one, but it turns out the truth lies somewhere in between a single and double bond, as explained in this lovely video.
If you do not have an account, you should get one, because it is awesome! You can save a playlist for each test or each chapter, and save your "greatest hits" into a "watch right before the final" list (not that we recommend cramming, but when in Rome...)